I'm new -- I need headphones!

Hello, all. I'm in the market for a pair of closed, reasonably portable, and comfortable headphones for under $400 (with or without a portable amp). I primarily listen to guitar-driven music -- a lot of metal, progressive rock, and fusion -- so natural mids are a plus. Durability and noise isolation are important to me, so I bought a pair of V-Moda Crossfade M-100s in the hopes that I'd be able to forgive the bass-heavy profile. I can't, and I find them to be extremely uncomfortable. They kind of squish the entrance to my ear canal...

I've been using Bose AE2s for a long time. They don't sound great (obviously), but I love how roomy the cups are. A fit like that would be best.

Amazon has had a lot of good deals lately, so I'll seriously consider any suggestion around the top end of my price range. So far, I've been considering Denon AH-D600s, Beyerdynamic DT770s, and some other similar builds.

Add the B&W P7 to your list. They're like a more detailed and dynamic version of the Momentum with a bit less bass. If your ears didn't fit the M-100 you would probably have problems with the Momentum too, otherwise I'd recommend that as well.

I suppose I could clarify a little about my dislike for the M100s. The biggest problem was the depth of the cup, not the width. The cans clamped my ear-flaps against my head. And I don't hate bass, either, but the V-Moda mega bass masked the mids quite a lot.